Home > C Cannot > C# Cannot Assign Null To Anonymous Type Property

C# Cannot Assign Null To Anonymous Type Property

The data types of the columns are returned to you as objects such as the following line: DirFName = dirRecord[0], If you use Go to Solution 15 Comments LVL 1 Never heard of the ?? How can I declare sovereignty from the American government and start my own micro nation? One of the real pains with the old DataSet Designer is that the Row properties generated are not nullable types. http://mediastartpage.com/c-cannot/c-cannot-assign-method-group-to-anonymous-type-property.html

It's just to tell that the ?? YearsAtCompany = (int)(c.Element("YearsAtCompany") ?? 0) Unfortunately you can't use that approach (it will give a compile error). Method's type signature is not Interop compatible. [Copying DataGridValues to excel cell object]] I have this original snippet which copies datagridview values into the microsoft excel sheet: Code: for ( int operator will return the alternate value we've provided: The ?? http://stackoverflow.com/questions/14317161/cannot-assign-null-to-anonymous-property-of-type-array

var products = ( from p in productsDB select new { Name = p() } ); try { products.ToList(); // runs the LINQ query products.Dump(); // prints the results (LINQPad) } Now, if you were using a named type for the value, you could just say (type)null and be done, BUT because you want an array of another anonymous type, there's no Borders table Latex Why are password boxes always blanked out when other sensitive data isn't? Does a key signature go before or after a bar line?

So you can't use ?? For example, consider the following XML. It is simply amazing. If one of the values is an empty string rather than null, it will return an empty string.

I love the operator, and the blank look on beginners faces when I describe it as the "Null coalescing operator" - although the name is descriptive ;-) It is also worth The code below, was referenced from MSDN, but i slightly modified some of it&... It is an ending to lots of problems you will face in managing your web application scripts and style she... However, I have not considered efficiency yet, does anyone know if XPath queries are much less efficient than using Descendants/Element, etc?

It's a very useful opertor nonetheless, and it's good to make a refresher for those who missed it ! Join them; it only takes a minute: Sign up Can I assign a null value to an anonymous type property? [duplicate] up vote 3 down vote favorite This question already has My manager said I spend too much time on Stack Exchange. How does it take internal knowledge of the compiler into account?

Powered by: Copyright © James Michael Hare

Toggle navigation ScottGu's Blog Home About RSS Sign In The C# ?? this contact form Link Listing WPF Azure Security Windows Server Data Commerce Server Atlas IIS7 Talks NuGet Windows Phone WPFE MVC Web Forms Ajax Tips and Tricks LINQ Hadoop ASP.NET Mobile Silverlight Web API Anyone know what it is? The index of all my past little wonders posts can be found here.

iptables not dropping by IP and port? check over here a class that contains just properties to hold data with little/no business logic) instead. However, there is a way to get a null reference in a variable of anonymous type. Powered by Blogger.

I think you'll like what you'll see. This will return null if the "Name" element doesn't exist. Ber From Argentina - Friday, September 21, 2007 12:43:12 PM Nice article Scott Is there a way to apply NumberFormat to decimals where I am assigning to the AskingPrice or does his comment is here Follow any comments here with the RSS feed for this post. ← Back to basics: Usage of static members Book review : C# in Depth Second Edition → Jon Skeet  Here's

I am certain I'll use that a great deal. asked 2 years ago viewed 2481 times active 2 years ago Linked 11 Cannot assign null to anonymous property of type array Related 986How do you give a C# Auto-Property a To pass an anonymous type, or a collection that contains anonymous types, as an argument to a method, you can declare the parameter as type object.

Get 1:1 Help Now Advertise Here Enjoyed your answer?

ConfigValue.Nullify() ?? "SomeOtherValue"; On C# 2.0, I guess we're stuck with the way it is now. So what do we mean by intermediate results in a local context?  Well, a classic example would be filtering down results from a LINQ expression.  For example, let’s say we had All rights reserved. Newton's second law for individual forces Depalindromize this string!

One issue that I ran into when using LINQ to XML was that often you want to run nested operations. The following code will cause an null reference exception Dim SomeOptionalValue As String ... I guess that would work too;var foo = new { Bar = default(string) }; 6/23/2012 4:17 PM | Mario #re: C#/.NET Little Wonders: The Joy of Anonymous Types @Mario: Yes, default(string) weblink A fix would be to do this (unfortunately both the null and the anonymous Planes array will need casting: var expected = new[] { new { PilotName = "Higgins", Planes =

We could check whether message was null, and return an alternate value using the code below: Because the "message" variable above wasn't null, the "result"variableis assigned the original "hello world" message Can I switch from past tense to present tense in an epilogue? Software Development Engineer in the Seattle area, who has been performing C++/C#/Java development for over 20 years, but have definitely learned that there is always more to learn! var anon = products.FirstOrDefault(); Console.WriteLine(anon.GetType().GetProperty("ProductName").GetValue(anon, null)); Or dynamic: IEnumerable products = null; // ...

Ryan 0 LVL 1 Overall: Level 1 Message Author Comment by:chuang46302010-06-05 I think the key is how to make the property of anonymous object nullable. 0 LVL 1 Overall: Because the objects of the API I'm testing are read only and I want the test to be 'declarative': self contained, simple and readable... C# Copy var anonArray = new[] { new { name = "apple", diam = 4 }, new { name = "grape", diam = 1 }}; RemarksAnonymous types are class types that When using it with strings you still have the same issue of having both EMPTY strings and NULL strings.

Without having to worry that the first call to element may return null, producing an exception. I'm not on my dev machine right now so I can't test that myself, but for some reason I don't think that works either. See example hereafter... System.Data.DataTable dt = new System.Data.DataTable(); dt.Columns.Add("FName"); dt.Columns.Add("LName"); dt.Columns.Add("Age"); System.Data.DataRow row; row = dt.NewRow(); row["FName"] = "Billy"; row["LName"] = "Joel"; in the listview databind?

Littlefool - Friday, September 21, 2007 7:21:17 AM I like this tip. Here's a simple example: Code view: Dim linkColumn... In that case , what is the problem with (int)e.Element("YearsAtCompany") ?? 0 Mehfuz - Friday, September 21, 2007 4:07:45 AM thanks for the post. operator works for both reference types and value types.For example, below we are checking whether the nullable integer "number" variable is null.

very much; I still tend to use the old style ( xxx==null?xxx:"foo"; ) out of habit, though it's a nice little operator. IEnumerable might do it then, but it does wipe out any compile-time type knowledge. –Andras Zoltan Jan 14 '13 at 11:10 Yes switching to IEnumerable would work - but Just like it should be always.

© Copyright 2017 mediastartpage.com. All rights reserved.